Zabbix

.......... [DEV-3750] added script item type checks to existing item, item prototype and LLD related selenium tests

* commit '829a88bb6c8e3da98cc15c68e5eb7570f9f306c6':
  .......... [DEV-3750] moved execute now check after saving the form
  .......... [DEV-3750] fixed wrong error message in test case
  .......... [DEV-3750] added script item type checks to existing item, itep prototype and LLD related selenium tests